Wrench



H". BUTT.

WRENCH.

APPLlc/mon man APR. 16. 1921,

133975262'. Patented Nov. 15, 1921.

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ATTRNEY HENRY BUTT, OF VERSAILLES, OHIO.

T OFFICE.

WRENCH.

Application filed April 16, 1921.

To all whom t may concern:

Be it known that I, HENRY Burr, a citizen of the United States, residing at Versailles, in the county of Darke and State of Ohio, have invented a new and useful Wrench, of which the following is a specification.

This invention relates to monkey wrenches of the type wherein the stationary jaw. 1s adapted to co-act with a movable Jaw slidable at will along the shank of the wrench upon the proper movement of a locking dog capable of rocking movement to free the same from engagement with the shank of the wrench, said locking dog automatically engaging the shank, when released, to prevent the separation of the two jaws when under pressure of turning a nut or other object upon which the wrench may be used.

The object of the invention is to provide a wrench of this type having a minimum number of operative parts and of simple construction` the same being readily assembled, the locking member carried by the movable jaw being fitted to engage the shank of the wrench and efectually prevent the retrograde movement of the said jaw, said locking member being located wholly within the confines of the latter, thus avoiding any projecting parts which might interfere with the operation of the wrench while in use in cramped places.

A full and complete understanding of the invention may be obtained from a consideration of the following detailed description, taken in connection with the accompanying drawing forming a part of this specification; it being understood that while the drawing shows a practical form of the invention, the latter is not to be confined to strict conformity therewith, but may be changed and modified so long as such changes and modifications mark no material departure from the salient features of the invention as specifically pointed out in the appended claim.

In the drawing, in which similar reference characters designate corresponding parts throughout the several figures z- Figure 1 is a side elevation of the improved wrench;

Fig. 2 is a bottom view of the wrench, as viewed in Fig. l;

Fig. 3 is a fragmentary view of the operative end of the wrench the movable jaw being shown in section;

Fig. 4 is a vertical, transverse sectional Specication of Letters Patent,

Patented Nov. 15, 1921.

serial No. 461,899.

view, taken on the, line 4-4 of Fig. 3 and looking in the direction of the arrow;

Fig. 5 is a detail side elevation of the movable jaw;

Fig. 6 is a front elevation of the twin leaf spring employed to actuate the locking dog of the movable jaw.

Referring to the drawing there is illustrated a wrench of the monkey wrench type having the usual shank'l, provided at one end with a stationary jaw 2, which may be joined to said shank in any well-known manner and having the customary outline, the said shank 1 being provided, at its opposite end with an ordinary handle 3, which may be formed of some hard wood and having a suitable bore for the reception of a reduced portion 4- of the shank, upon which it fits in abutting relation to a washer 5 and held in position by a nut 6, all of which may be of the ordinary construction.

Adapted to co-act with the stationary jaw 2 and to slide upon the shank l, which is preferably rectangular in cross section, is a movable jaw 7 which is preferably similar to the j aw 2 in outline and is provided with a rectangular opening or passageway 8 for said shank.

The movable jaw 7 is provided with an internal extension 9 adapted to slide along one edge of the shank and which terminates in a right-angularly disposed guide arm 10 arranged parallel to the movable jaw and having a longitudinally disposed passageway 11, in alinement with the openin or passageway 8 of said jaw, through w ich the shank is adapted to freely slide back and forth during the operation of the wrench.

The side faces of the movable jaw are flat and parallel and within the space between the jaw and the guide arm, a locking dog 12 is adapted' to operate in a manner to be described.

The locking dog 12 is of loop shape and comprises a transversely disposed pivotal bar 13 at one end and adapted to lie across the edge of the shank 1 which is engaged. by the extension 9 of the movable jaw, the latter having a semi-circular passageway or bearing 14; formed therein for the reception of said pivotal bar 13 of the dog. Joined to the pivotal bar at each end thereof, are spaced parallel arms 15 adapted to lie against the opposite side faces of the shank and to extend below the lower edge of the same, where the said arms are joined together by of the locking dog. The outer races of thev arms of the latter are the same distance apart as the opposite side faces of the movable jaw and the spaced guide arm 10 carried thereby, so that the dog has no projecting portion, the lower edge of the shankengagingv bar 16 being a less distance from the lower edge of the shank than the lower ends of the jaw 7 and the extension 10. rlhe lower end of the dog lies substantially mid- Y way between the parts and 10 of the movable jaw, while the bearing 14e is located `somewhat closer to the extension than to the jaw 7 so that, when the dog is in normal position, with the front edge of the engaging bar 16 in biting engagement with the lower edge of the shank, the said dog lies in an inclined position, as clearly shown in the drawing. A

In order to maintain the dog in such position, a leaf spring 17 is employed, having twin arms 18 adapted to lie against the rear.

edges of each of the parallel arms 15 of the dog, the said arms being joined at their upper ends by a cross bar 19 which is adapted to itwithin a transverse slot 20 formed diagonally in the extension 9 at its point of juncture with the guide arm 1()e The normal tendency of the sering is to force the dog forwardly so that the forward upper corner of the-.rectangular engaging bar 15 will impinge ag yinst the lower edge `of the shank; Assuming the jaws 2 and7 t0 be engaged with a nut or other article, the tendency, upon turning the wrench to unscrew' the same, is to separate the active ends of the jaws, Iwhereupon the pivotal bar 13 of the dog is forced to the rear which causes the engaging bar to further bite into the shank. When it is desired to release the jaws, or to open the same farther to receive a larger nut or other obj ect the operator may easily insert a finger between the lower portion of the jaw and the lower part of the dog, and force the latter to the rear to free the dog from its impingement with the shank, when the movable jaw may freely slide in either direction, as long as the dog is so heldj Upon release, the spring will immediately force the dog into engagement with the shank.

From the foregoing it will be seen that a simple and cheaply manufactured adjustable wrench has been provided which has no projecting parts to interfere with its operation, or to accidentally release the locking dog, and that .the latter elfectually prevents the separation of the jaws while under strain, until actuated by the hand of the operator, and it will be further seen that the movable jaw may be easily moved in a direction toward the stationary jaw4 without actuating` the dog, when nothing is interposed between said jaws.

IVhat is claimed is: A wrench comprising a shank having a stationary jaw, a co-acting jaw movable along the shank, said movable jaw havingl a rig t-angular extension parallel with the shank and bearing against one edge of the same, a guide arm connected to the extension in parallel relation to the movable jaw and having a passageway for the shank, a locking dog having a transversely disposed bar mounted in and containedr wholly within an open bearing provided in the face of the extension next to the shank, said dog having arms located at each side of the shank and a shank-engaging bar carried by the free ends of the arms and adapted to impinge against the rear edge of the shank,

said doo; lying substantially flush with the side faces of the movable jaw and guide arm and having` no projecting parts, and a twin leaf springv mounted in the said eX- tension and adapted to bear against the arms of the dog to force the same in position to impinge on the shank. A In testimony, that I claim the foregoing as my own, I have hereto aHiXed my signature.

.j HENRY BUTT. 

